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Coupling matter in ...
Coupling matter in modified Q gravity
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- Harko, Tiberiu (författare)
- Babes Bolyai Univ, Dept Phys, Kogalniceanu St, Cluj Napoca 400084, Romania.;Sun Yat Sen Univ, Sch Phys, Guangzhou 510275, Guangdong, Peoples R China.;UCL, Dept Math, Gower St, London W E 6BT, England.
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- Koivisto, Tomi S. (författare)
- KTH,Stockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Nordic Institute for Theoretical Physics NORDITA,Stockholm Univ, Roslagstullsbacken 23, S-10691 Stockholm, Sweden.
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- Lobo, Francisco S. N. (författare)
- Univ Lisbon, Fac Ciencias, Inst Astrofis & Ciencias Espaco, Edificio C8, P-1749016 Lisbon, Portugal.;Univ Lisbon, Fac Ciencias, Dept Fis, Edificio C8, P-1749016 Lisbon, Portugal.
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- Olmo, Gonzalo J. (författare)
- Univ Valencia, CSIC, Ctr Mixto Univ Valencia, Dept Fis Teor, E-46100 Valencia, Spain.;Univ Valencia, CSIC, Ctr Mixto Univ Valencia, IFIC, E-46100 Valencia, Spain.;Univ Fed Paraiba, Dept Fis, BR-58051900 Joao Pessoa, Paraiba, Brazil.
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- Rubiera-Garcia, Diego (författare)
- Univ Lisbon, Fac Ciencias, Inst Astrofis & Ciencias Espaco, Edificio C8, P-1749016 Lisbon, Portugal.
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Babes Bolyai Univ, Dept Phys, Kogalniceanu St, Cluj Napoca 400084, Romania;Sun Yat Sen Univ, Sch Phys, Guangzhou 510275, Guangdong, Peoples R China.;UCL, Dept Math, Gower St, London W E 6BT, England. Nordiska institutet för teoretisk fysik (Nordita) (creator_code:org_t)
- American Physical Society, 2018
- 2018
- Engelska.
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Ingår i: Physical Review D. - : American Physical Society. - 2470-0010 .- 2470-0029. ; 98:8
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- We present a novel theory of gravity by considering an extension of symmetric teleparallel gravity. This is done by introducing, in the framework of the metric-affine formalism, a new class of theories where the nonmetricity Q is nonminimally coupled to the matter Lagrangian. More specifically, we consider a Lagrangian of the form L similar to f(1)(Q) + f(2)(Q)L-M, where f(1) and f(2) are generic functions of Q, and L-M is the matter Lagrangian. This nonminimal coupling entails the nonconservation of the energy-momentum tensor, and consequently the appearance of an extra force. The formulation of the gravity sector in terms of the Q instead of the curvature may result in subtle improvements of the theory. In the context of nonminimal matter couplings, we are therefore motivated to explore whether the new geometrical formulation in terms of the Q, when implemented also in the matter sector, would allow more universally consistent and viable realizations of the nonminimal coupling. Furthermore, we consider several cosmological applications by presenting the evolution equations and imposing specific functional forms of the functions f(1)(Q) and f(2)(Q), such as power-law and exponential dependencies of the nonminimal couplings. Cosmological solutions are considered in two general classes of models, and found to feature accelerating expansion at late times.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Matematik (hsv//swe)
- NATURAL SCIENCES -- Mathematics (hsv//eng)
Nyckelord
- Alternative gravity theories
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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